Payne was required as a part of his parole to reveal the passcode/password to his electronic devices. He had already told, when asked, the officer the color and location of his phone, then when asked for the passcode he denied the phone was his. That's when the officer physically forced him to unlock it with his thumb (this is the contentious part in the case).

The fourth amendment challenge against the search starts on page 10, and the fifth amendment challenge on page 21. The fact that he was a parolee substantially factors into the decision regarding the fourth amendment challenge.